Analysis of Pyrophosphate and Tripolyphosphate

To separate pyrophosphate(H₂P₂O₇^2-) and tripolyphosphate (H₃P₃O₁₀^2-) by ionexchange, an acidic eluent where they have a low ionic value is employed.

Sample : 150mg/L each, 100µL
1. H₂P₂O₇^2-
2. H₃P₃O₁₀^2-

 Column : Shodex IC NI-424 (4.6mmID*100mm)
 Eluent : 8mM H2SO4 + 0.04mM EDTA·2Na aq.
 Flow rate : 1.0mL/min
 Detector : Shodex RI
 Column temp. : 40°C